Justin's in for a bumpy ride as he investigates gigantic potholes in Louisiana. Later, he heads to London to get a sneak preview of London's vast Crossrail project.
Justin braves the turbulent North Sea as he goes inside an offshore wind turbine to see how engineers are fixing a fault that could cause these structures to fall into the sea.
Would you ever believe a skyscraper can melt a car? Justin heads to London's Walkie Talkie building to unearth the science behind this building blunder.
Justin uncovers the truth behind a landslide that wiped out a ski-jump resort in Turkey, before jetting off to Gibraltar to see an airport runway built across a road.